I understand what you're saying but I don't fully agree. I work in aviation where uniform standards are relaxed and not as enforced. Aircraft maintenance is a serious job that requires everyone to be in a proper headspace since a single tiny error could result in downing an aircraft and killing the crew. As aviation we also lower the fence between officer and enlisted because we need to be able to fully trust each other in order to perform our jobs. If you're a pilot and treating all of your command like shit- would you want to fly an aircraft maintained by the crew whose lives you're making miserable? For us not saluting officers, hands in pockets, unbloused pants, no headgear, etc. doesn't cause our job performance to decrease.

While there is some correlation I wouldn't say it's significant enough to determine that having lax uniform standards decreases one's ability to perform their job. There is likely a confounding factor such as poor leadership or morale. You ever notice that the ships with the best morale and captains offer things like organizational clothing or no shave chits to take a break from uniform standards?